Package org.apache.drill.common.expression.visitors

Visitors for validating or optimizing logical expressions.

See: Description

Interface Summary

Interface	Description
ExprVisitor<T,VAL,EXCEP extends Exception>
OpVisitor

Class Summary

Class	Description
AbstractExprVisitor<T,VAL,EXCEP extends Exception>
AggregateChecker
ConditionalExprOptimizer
ExpressionValidationError
ExpressionValidator
SimpleExprVisitor<T>

Exception Summary

Exception	Description
ExpressionValidationException

Package org.apache.drill.common.expression.visitors Description

Visitors for validating or optimizing logical expressions. These visitors are used to provide feedback to users on invalid expressions as well as some basic optimizations applied during planning.